Cooling fin for internal combustion engines



Sept 1, 1931. E. H. HAMILTON COOLING FIN FOR INTERNAL COMBUSTION ENGINESFiled Jan. 27, 1923 INVENTOR W r/vEssEs :1

Fatented Sept. l, 193i ERWIN n. HAMILTON, or RIVERDALE, NEW Yon cooLInGFIN roarn'rnnnni. eoiasesmasmms Application filed January 2?, 1923.Serial No. 615,401.

This invention relates to improvements in the construction and formationof cooling or heat radiating fins. One use for such fins that will bereferred throughout the following specification is upon air-cooledinternal com bustion engines. i

It is one object of my invention to provide a typeof cooling fin, orrather a plurality of fins that will bring the whole body of cooling airinto more intimate contact with the cooling surfaces. I

It is another object of my invention to provide a construction ofcooling fin, which when assembled with a plurality of other coolingfins, will create a turbulent flow of air through the air passagesbetween the cooling this.

It is a further object of my invention to provide cooling surfaces thatwill cooperate with each other to create a constantly diverging butnevertheless forwardly progressing current of air passing over thecooling surfaces.

It is a still further object of .my-invention' to provide a plurality ofcooperating cooling fins with inclined surfaces, the inclination beingso designed and spaced with respect to each other that a current of airflowing over the cooling surfaces will flow from one inclined surface toanother surface inclined in the same general direction but spaced later-.ally therefrom, so that while the current of air between thecoolingsurfaces is caused to constantly change its path, there nevertheless isnothing located in the paths to which the air currents are directed soas to cause an abrupt arresting of the currentsof air, but

rather a steady forward progression in: as

not in fact present. r 7

Other and further objects of my invention will be apparent from thefollowing specification taken in conjunction with the'accompanyingdrawings, wherein Figure 1 is a fragmentary view of a cyllarge volume asif the inclined surfaces were inder provided with continuous, one-piececooling fin of my improved construction,

Fig. 2 is a fragmentary view of a surface to be cooled equipped withstraight cooling fins surrounded by-a shroud or contacting coolingsurface of my improved construction;

Fig. 3 is a fragmentary view of a surface to be cooled, and coolingfins, the surface to be cooled being constructed as the outer coolingsurface or shroud of Fig. 2;

Fig. 4 is a modified form of cooling fins provided with indentations ofa conforma tioi to produce the above-referred to effects, an

Fig, 5 is a further modified form of cooling fin arrangement providingthe type of 00- acting inclined surfaces referred toabove.

Referring to Fig. 1, the cylinder 2 is.pro-

vided with a plurality of cooling fins l, spaced laterally from eachother.

The cooling fins 1 are provided with a plurality of corrugations orindentations 4;. These corrugations or indentations are not of thesubstantially semi-circular shape, but are each; provided with graduallysloping surfaces 3 and 5, which terminate in the base or apex oftheindentation on respective sides surface that is more or less at rightangles to its path, but instead the cur} rent of air passes over thehead of the particular indentation t and directly onto and along thesurface 5 of that indentation. The current of air will flow along thesurface 5 into the indentation connected thereto, and

along its surface corresponding to the surface 3 referred to above,which surface 3 will direct the current of air back toward the fin fromwhich it first came, but diagonally and in a forwardly progressingdirection, where the current of air will engage another in clinedsurface that is inclined in the direction of its flow.

The above described cycle is occurring between each pair of fins andalong the surfaces 3 and 5 of the indentation spaced laterally anddiagonally from each other.

Referring now to'Fig. 2, a cooling surface 22 is shown as provided witha plurality of laterally spaced cooling fins 21 that are here shown asthe usual and customary straight surface cooling fins, These aresurrounded and bound by a cooling fin or surface or shroud 23, whichcooling surface is provided with a plurality of indentations 2 1 each respectively provided with inclined surfaces 26' and 27, correspondingrespectively to the surfaces3 and 5 described above in connection withFig. 1.

In this form of the invention, the air currentwill be directed from asurface 27 di agonally across to the surface 22 to be cooled, and bedeflected from that surface diagonally back to the fin or shroud23,where it will engage a surface 26, flow into and out of an indentation2% in the same manner as described above in connection with Fig. 1,without an abrupt interruption of the air current which will result: ineddy currents in the indentations and thus interfere with the fullcooling effect of the particular volume of air passing between thecooling fins.

Referring to Fig. 3, the reverse of the arrangement of Fig. 2 is shown.Herethe surface to be cooled 32, is provided with a plurality of coolingfins 31 that are surrounded bya shroud 33, the cooling fins and shroud33' being shownas straight, smooth surfaces. The outer surface of thesurface to be cooled is provided with a plurality of indentations 3 1each having an inclined surface 36' and'3'? respectively of the sameshape and adapted to function in the same manner as described inconnection with Fig. 2.

Referring'to Fig. 4, there is shown a modified construction of coolingfin. The cylinder 42 is provided with a plurality of spaced cool ingfins 11. There is struck-up or pressed in each fin a plurality of bafliesections 4L5. Each section resembles in shape one half section of acone,and the two adjacent baffles are arranged with the bases of thecone sections toward each other. With this form and arrangement ofbaflies the air currents are caused to bedeflected from one cooling finto another and there, is no danger of causing an abruptarresting of theforwardly moving air currents. whilethe air currents are neverthelessput in a state of commotion so asto cause the full volume of air toengage the surfaces of the cooling fins.

In Fig. 5 there is shown a still further modified arrangement of coolingfins and battles. Herein, the wall 52 to be cooled is provided with aplurality of cooling fins 51 which are straight sided members spacedapart. Mounted in the channels between the fins are a plurality ofbaffles 56 which are oblong shaped and arranged angularly with onebaffle inclined in one direction and the next adjacent baffle inclinedin a direction substantially at right angles to the first baflle, and soon alternately along the channels. However it will be noted thatthebaflles are not arran 'ed vertically and horizontally but angularlyso that the air currents are directed back and forth from fin to fin butare always free to progress forwardly through the channel unimpeded butin fact directed by the angularly arranged surfaces of the baffles.

From the foregoing it will be seen that I have provided a number ofarrangements or constructions of cooling fins and/or associated bafflesthat accomplish almost equally well the major purpose of this inventionof placing the air currents passing over a surface to be cooled insubstantial commotion so as to bring the mass of air in contact with thesurfaces and yet aid and abet the movement of the turbulent air throughthe channels between the cooling fins by proper direction and guidancethereof, while at the same time increasing the area of the coolingsurfaces.

t will be understood that various modifications and arrangement of partsmay be the air current whereby the full volume of air thereoverin acontinuous forwardly progressing movement.

means for assisting in such cooling and governing the direction of flowof said air currents, some of said means presenting inclined surfaces tocausethe air currents to flow from a one surface to another, thedirection of inclination being in the direction to cause continuousforward progression of the air currents over the cylinder.

4. The combination with a cylinder adapt- 10 ed to be cooled by aircurrents passing thereover, of a plurality of heat radiating devicesmounted thereon and arranged With inclined surfaces over which aircurrents may pass, inclined surfaces that are Vertically spaced 1 apartof difierent and adjacent radiating devices being in the same plane.

ERVVIN H. HAMILTON.

